Annotation

      In this article the estimation procedure of the critical speed (fluidization speed) and the dust loss defining the frames existance of the CFB bed is given. The dust loss and the critical speed estimations for coal particles from 0,05 to 2,5 mm were given. Graphical dependency was made, CFB frames and the conditions of the existance were evaluated.Aerodynamic and design characteristics of CFB boiler were analyzed.